Take-up device for web-shaped materials, especially plastic films

Abstract

In the take-up device for web-shaped materials, especially plastic films, there is at least one bearing unit which acts between the ends of the contact roller on its peripheral compressive surface and supports the contact roller. The contact roller is made with a relatively small diameter and is made flexurally soft such that via the bearing unit(s) the bending line and the damping behavior of the contact roller between its ends can be influenced and advantageously also controlled.

1. A take-up device for web-shaped materials comprising:
 a take-up roller; 
 a contact roller which presses the web-shaped material against the take-up roller by means of a peripheral compressive surface; and 
 at least one bearing unit which acts between the ends of the contact roller on its peripheral compressive surface and supports the contact roller, 
 wherein said at least one bearing unit is adjustable in at least two directions which run perpendicular to one another, and wherein the contact roller is flexibly supported such that moving said at least one bearing unit causes a bending line of the contact roller to adjust with respect to the web-shaped material. 
 
   
   
     2. The take-up device as claimed in  claim 1 , wherein the diameter of the contact roller is:
 a maximum 550 mm when its working width is more than 8 m, 
 a maximum 400 mm when its working width is between 3 and 8 m, and 
 a maximum 200 mm when its working width is less than 3 m. 
 
   
   
     3. The take-up device as claimed in  claim 1 , further comprising:
 sensor means which detect at least one of the position, path, force and acceleration of the contact roller via the at least one bearing unit, and 
 control means which controls the adjustment of the at least one bearing unit and thus the setting of at least one of the bending line and damping of the contact roller depending on the data acquired by the sensor means. 
 
   
   
     4. The take-up device as claimed in  claim 1 , wherein along the contact roller there are a plurality of bearing units which are adjustable independently of one another in different directions. 
   
   
     5. The take-up device as claimed in  claim 1 , wherein the at least one bearing unit is an air or magnetic bearing. 
   
   
     6. The take-up device as claimed in  claim 1 , wherein the at least one bearing unit comprises a vertical bearing segment which vertically supports the contact roller and a horizontal bearing segment which horizontally supports the contact roller and which is movably guided in or on the vertical bearing segment. 
   
   
     7. The take-up device as claimed in  claim 6 , wherein the vertical bearing segment and the horizontal bearing segment are interdigitally internested. 
   
   
     8. The take-up device as claimed in  claim 6 , further comprising a base support which is located parallel to the contact roller, wherein the vertical bearing segment is supported by the base support so as to be vertically movable and floating in the horizontal direction. 
   
   
     9. The take-up device as claimed in  claim 8 , wherein within the base support there is an intermediate support for the vertical bearing segment with a vertical movement capacity, in which the vertical bearing segment is fixed vertically and is supported to float horizontally, and wherein between the base support and the intermediate support a vertical actuator is active in order to keep the intermediate support in a certain vertical position. 
   
   
     10. The take-up device as claimed in  claim 6 , wherein the vertical bearing segment has two bearing legs which support the contact roller from opposing sides and between which the horizontal bearing segment can be moved. 
   
   
     11. The take-up device as claimed in  claim 10 , wherein each bearing leg has two spaced bearing fingers between which the horizontal bearing segment can be moved. 
   
   
     12. The take-up device as claimed in  claim 10 , wherein at least one bearing leg is located to be able to swivel on a retaining arm of the vertical bearing segment. 
   
   
     13. The take-up device as claimed in  claim 6 , wherein the horizontal bearing segment is reciprocally movable and can be adjusted in the direction of the contact roller by a horizontal actuator which acts between the base support and the horizontal bearing segment. 
   
   
     14. The take-up device as claimed in  claim 6 , wherein between the vertical bearing segment and the base support there are sensor means for detecting at least one of the bearing forces, position and vibrations of the vertical bearing segment. 
   
   
     15. The take-up device as claimed in  claim 6 , wherein between the horizontal bearing segment and the base support there are sensor means for detecting at least one of the bearing forces, position and vibrations of the horizontal bearing segment. 
   
   
     16. The take-up device as claimed in  claim 1 , wherein the at least one bearing unit is adjustable in an axial direction of the contact roller. 
   
   
     17. The take-up device as claimed in  claim 1 , wherein in a middle area of the contact roller than toward the ends of the contact roller. 
   
   
     18. The take-up device as claimed in  claim 1 , wherein the contact roller is supported at several positions over the working width by bearing units in the form of short rubber rollers. 
   
   
     19. The take-up device as claimed in  claim 1 , wherein the diameter of the contact roller is:
 a maximum of 400 mm when its working width is more than 8 m, 
 a maximum of 300 mm when its working width is between 3 m and 8 m, and 
 a maximum of 200 mm when its working width is less than 3 m.